On Mon, Jan 15, 2018 at 11:54 AM, <tonywalker...@gmail.com> wrote: > > Thanks Ian. This did the trick and now I'm faced with the problem of > function signatures that include 'const'. On my system, fopen is declared > thus: > extern FILE *fopen (char *p0, char *modes) __wur > But fopen64 is: > extern FILE *fopen64 (const char *__restrict __filename, const char > *__restrict __modes) __wur > > So, now my override function conflicts: > > In file included from _cgo_export.c:3:0: > cgo-gcc-export-header-prolog:44:14: error: conflicting types for ‘fopen64’ > In file included from ./main.go:5:0, > from _cgo_export.c:3: > /usr/include/stdio.h:298:14: note: previous declaration of ‘fopen64’ was > here > extern FILE *fopen64 (const char *__restrict __filename, > ^~~~~~~ > _cgo_export.c:37:7: error: conflicting types for ‘fopen64’ > FILE* fopen64(char* p0, char* p1) > ^~~~~~~ > > I'm guessing there's not much I can do about the limitation of dealing with > 'const' declarations in C?
The simplist workaround is to export go_fopen64, and write a tiny fopen64 in a different C file, with the right signature, that calls go_fopen64. Ian > On Monday, January 15, 2018 at 2:35:19 PM UTC-5, Ian Lance Taylor wrote: >> >> You neglected to say which system you are running on. If it's >> GNU/Linux, note that fopen64 is not declared by default. It's only >> declared if define the C preprocessor macro _LARGEFILE64_SOURCE while >> compiling the file. You may need a #cgo CFLAGS: line to add a -D >> option. >> >> Ian > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
